Search found 2440 matches

by Sunder
Apr 16, 2018 10:46 pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 4907
Views: 292434

Re: new eZip motor

It is very obvious to me why gas still rules the world. It is because only about 10% of the people in the world can afford good batteries for any EV. A gallon of gas is usually less than $4 a gallon and is much more difficult to scam someone on. Basically until better batteries are produced any veh...
by Sunder
Apr 15, 2018 6:08 pm
Forum: General Discussion
Topic: Credit Card Problems?
Replies: 16
Views: 595

Re: Credit Card Problems?

Doesn't the US have a financial services ombudsman? I work in cybercrime detection and response which includes financial crimes. Nothing strikes fear in the heart of a bank worker than saying you think you have a case to involve the ombudsman and actually seem to know what you're talking about. Firs...
by Sunder
Apr 14, 2018 6:43 pm
Forum: General Discussion
Topic: What if there was no gas/petrol?
Replies: 1
Views: 57

What if there was no gas/petrol?

Read this article last night: http://www.dailymail.co.uk/news/article-5614947/Fears-petrol-prices-Australia-rise-airstrikes-Syria.html TL:DR unlike most countries, Australia doesn't keep a strategic petrol reserve. It said within 2-3 weeks Australia would be out of petrol... But I fill up around onc...
by Sunder
Apr 06, 2018 12:04 am
Forum: Battery Technology
Topic: Help me reinforce this DC to DC step up.
Replies: 8
Views: 333

Help me reinforce this DC to DC step up.

So I melted a 10A rated step up converter with just 2.5A, so now I've bought a 40A version: 20180406_142756.jpg Absolutely Buckley's hope this will handle 40A. I knew that when buying it, but it's worse than I thought. I had intended to upgrade the heat sink on this, but as you can see on the side v...
by Sunder
Apr 02, 2018 9:26 pm
Forum: Battery Technology
Topic: Mixing lipo and lithium ion batteries
Replies: 2
Views: 125

Re: Mixing lipo and lithium ion batteries

Yes, its possible. Depending on use and diffefence in cell performance, you might not even require the control circuitry you describe. I am running a 36S LiPo woth 43S LiFePo4 for 18 months with no issues. I have also run 8S LiFePo4 with 11S LTO for 8 months with no issues. No control circuits for e...
by Sunder
Apr 02, 2018 5:57 am
Forum: Battery Technology
Topic: Cheap 14.7v step up to 29.4v? ~ 500w
Replies: 5
Views: 142

Re: Cheap 14.7v step up to 29.4v? ~ 500w

I actually have another 600w of panels in the house, but right now, no good place to put them. It's hard to explain when you've got 55 hectares of land, but built the house into the side of a hill in thick bush. The council had limits on how many trees could be knocked down for the house and shed, s...
by Sunder
Apr 01, 2018 9:06 pm
Forum: Battery Technology
Topic: Cheap 14.7v step up to 29.4v? ~ 500w
Replies: 5
Views: 142

Re: Cheap 14.7v step up to 29.4v? ~ 500w

Thanks Punxor. The 12 to 24v systems I looked at literally had an output to 24v, which means they wont charge an 8S LiFePo4 I had thought of a 240v system driven directly from the car. Still an option but a less desirable one. I have about 600w of Meanwells that can drop to 29v. From advice from an ...
by Sunder
Apr 01, 2018 6:44 am
Forum: Battery Technology
Topic: Cheap 14.7v step up to 29.4v? ~ 500w
Replies: 5
Views: 142

Cheap 14.7v step up to 29.4v? ~ 500w

Hi All, I'm trying to figure out how to get 14.7v to 29.4v reasonably cheaply. My car has a 1500w traction battery to 14.7v step down, which I'd like to use to charge a 3kwh off-grid holiday home battery. There's currently 600w of solar panels here, so typically takes 2 sunny days to fully charge, w...
by Sunder
Mar 28, 2018 6:06 pm
Forum: Battery Technology
Topic: Fake or genuine A123 ANR26650M1B - Grade A
Replies: 2
Views: 182

Re: Fake or genuine A123 ANR26650M1B - Grade A

Not to state the obvious... (Okay, I'll state the obvious)... But you can get a photo from anywhere, and ship something different, and even if the photo is genuine, it's very easy and cheap to print sleeves for a battery that look genuine. Time on the market and user ratings also aren't great. I've ...
by Sunder
Mar 24, 2018 6:15 pm
Forum: E-Bike General Discussion
Topic: Found/Abondoned Bicycles
Replies: 19
Views: 824

Re: Found/Abondoned Bicycles

Not suggesting criminals do it. Bump keys cost, and possession with intent is illegal. I'm suggesting for anyone cleaning up, it might be a bit less messy than leaving just a wheel there, and a bit less destructive than grinding through a chain/cable. For a non integrated one, you might even be able...
by Sunder
Mar 23, 2018 3:53 am
Forum: Battery Technology
Topic: Ebike (lead acid) stored over winter in un heated garage question
Replies: 8
Views: 339

Re: Ebike (lead acid) stored over winter in un heated garage question

I wouldn't assume it was dead quite yet. Charging once a month should have kept the batteries from sulfating too much. Would have been more ideal to keep them on float, but once a month isn't too bad. Lead Acid does suffer immensely under cold weather though (temporarily, unless the acid totally fre...
by Sunder
Mar 22, 2018 6:15 pm
Forum: Battery Technology
Topic: New way to quickly evaluates self-discharge of li-ion cells
Replies: 3
Views: 183

Re: New way to quickly evaluates self-discharge of li-ion cells

Cool! Could probably build one from an arduino or similar if I had time with logging and timing... but is one commercially available? So many cool things I could do if I had the time. Actually, I already own a USB counting ammeter. It won't stop after a certain time, but it records the time that it ...
by Sunder
Mar 22, 2018 4:17 pm
Forum: E-Bike General Discussion
Topic: Found/Abondoned Bicycles
Replies: 19
Views: 824

Re: Found/Abondoned Bicycles

I'm hoping I'm not giving anyone ideas here, but I've bought a range of locks from $2 right up to $79 hardened "bolt cutter proof" ones. But they all had one weakness. They all used one sided pin and tumbler locks with 4 pins or fewer. (One had 2. That one I didn't even have to pick. Inserting the l...
by Sunder
Mar 22, 2018 4:08 pm
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

110% Reliable Justin over at www.ebikes.ca has batteries, Vancouver Canada. EM3EV, China OSN Power is in the same boat as Unit Pack Power - http://www.osnpower.com/pddetaildate/profirstlist/20180317_3210497_1.html I'll back both EM3EV and OSN. Bought from them both, and their kit and service is rea...
by Sunder
Mar 21, 2018 7:57 pm
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

2.) Build Hobby King Prismatic pack, although just from your picture and description, I must say, I don't get it. I know for a fact that I dont want to mess with 6s+6s+4s. Okay, will keep it simpler, assuming that you want a 12S pack instead of a 20S pack. Since 12S packs are rare and expensive, we...
by Sunder
Mar 21, 2018 4:49 am
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

Definitely soldering, not spot welding. Generally 18650s are spot welded, so if you don't have a spot welder, you probably need one if 18650s are your preference (or buy pre-built). Hobbyking Prismatic cells look like this: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSeqNAO1tIm-gndk0vQzfQD...
by Sunder
Mar 20, 2018 9:19 pm
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

Alright, having found the exact kit, here's my recommendations: 1. The kit takes 48-72v. The kit is geared, so there is no issue with too high a top speed as long as you know how to gear properly. So my recommendation is to use 72v, but be real careful using the 54T front with any small gear at the ...
by Sunder
Mar 19, 2018 6:47 pm
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

Chill out dude. Are you wearing a tin hat? I'm not about to set the police onto you for building a 7500w bike. Your intended use makes a big difference, and especially now you've clarified you want the whole battery and not just the BMS, it's even more important to ask questions. I could just recomm...
by Sunder
Mar 19, 2018 5:50 pm
Forum: Battery Technology
Topic: Lipo low voltage shut off device?
Replies: 3
Views: 157

Re: Lipo low voltage shut off device?

Does one device have to suit all? Or are you putting one protection device per battery? What you're speaking of is called a BMS, or battery management system. If it's a fixed config, then they're pretty cheap, $20-100 depending on what current you want. http://bestechpower.com/296v8spcmbmspcbforli-i...
by Sunder
Mar 19, 2018 5:44 pm
Forum: Battery Technology
Topic: 100amp bms battery pack
Replies: 15
Views: 572

Re: 100amp bms battery pack

Google? Seriously, with no information, not many people can make good referrals. Bestech Power has been used by a few people on this forum: http://bestechpower.com/ Ebay will have some generics you can pair with a relay to get to 100A You might want a custom system from individual cell balancers + a...
by Sunder
Mar 18, 2018 3:36 pm
Forum: Battery Technology
Topic: 12s charger or supply 50.4v cc/cv
Replies: 11
Views: 281

Re: 12s charger or supply 50.4v cc/cv

I'm pretty sure you will be happy with your purchase if you went genuine. As you can see in my signature, I really accept the old adage "the poor pay twice". The problem with cheap stuff in electronics is that not only can it fail, it can take other stuff with it. I had a cheap BMS destroy a pack be...
by Sunder
Mar 17, 2018 4:45 pm
Forum: Battery Technology
Topic: 12s charger or supply 50.4v cc/cv
Replies: 11
Views: 281

Re: 12s charger or supply 50.4v cc/cv

I tried the BMSBattery chargers, but lost a few to poor quality.

Have installed genuine Meanwell (HLGs, I think,the adjustable water proof ones) and they have riden with me to hell and back. Try this one : HLG-600H-54
by Sunder
Mar 17, 2018 4:40 pm
Forum: Battery Technology
Topic: Drill battery build help - Noobie seeking direction
Replies: 11
Views: 384

Re: Drill battery build help - Noobie seeking direction

Tempted to say bypass the BMS if you know the cells are good for it, which is fine 99% of the time. But the manufacturers rely on the BMS to protect not only the battery, but by default the motors as well. They know the BMS will cut power before the motor burns out. If you go way oversize or no prot...
by Sunder
Mar 12, 2018 10:53 pm
Forum: Battery Technology
Topic: Drill battery build help - Noobie seeking direction
Replies: 11
Views: 384

Re: Drill battery build help - Noobie seeking direction

Either you're over-thinking it, or I'm under thinking it. P- usually refers to the negative of the load. Since your "load" doesn't exist until you plug your battery into your drill, you solder a wire between the BMS point marked P- and the negative terminal of the finished pack. (not the raw battery...
by Sunder
Mar 12, 2018 2:22 am
Forum: Battery Technology
Topic: Ryobi Mosfet Burned. Worth Replacing?
Replies: 2
Views: 147

Re: Ryobi Mosfet Burned. Worth Replacing?

I guess it wouldn't hurt to try, except that if it's less than a 50/50 chance I'll get a working battery out of it (2 years old and sagging at that), then I don't want to invest the time, I'd rather buy a fresh one. I never found a decent HK LiPo that would fit (all 1300mAh or smaller - 2200mAhs wer...